Enum ImpossibleRequirements 

pub enum ImpossibleRequirements {
    BeforeAndAfter(Box<dyn Label>, Box<dyn Label>),
    ImpossibleConstraints(Box<dyn Label>, Vec<Box<dyn Label>>, Vec<Box<dyn Label>>),
    Cycle(Vec<Box<dyn Label>>),
}

Returned when requirements for a workload make it impossible to build a valid workload.

Variants

BeforeAndAfter(Box<dyn Label>, Box<dyn Label>)

ImpossibleConstraints(Box<dyn Label>, Vec<Box<dyn Label>>, Vec<Box<dyn Label>>)

Cycle(Vec<Box<dyn Label>>)

Trait Implementations

impl Clone for ImpossibleRequirements

fn clone(&self) -> ImpossibleRequirements

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ImpossibleRequirements

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for ImpossibleRequirements

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Error for ImpossibleRequirements

Available on crate feature std only.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for ImpossibleRequirements

fn eq(&self, other: &ImpossibleRequirements) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ImpossibleRequirements